Invacare electra - Magnet Brake; Freewheel Switch; Carbon Brushes

Service Manual Invacare
®
Electra
As at: 15.04.02 Page 33
11.2.2 Magnet brake
• Remove drive unit panelling (see chapter 9.3 page: 19).
• Remove the drive unit connecting plug at the controller (3).
• Engage motors.
• Set the Multimeter to resistance measuring.
• Measure the continuity or resistance (R
req
= 20 Ω) of the brake coil motor
circuit between the grey and white cable on the motor plug.
Drive unit connector
plug
Test results: Chapter:
R = 0 Ω.
R > 200 Ω, but < ∞.
• Short-circuit in
magnetic brake.
• Fine short circuit in
magnetic brake.
Þ Replace drive unit.
Þ Replace drive unit.
Chapter: 9.6.5 page: 24
Chapter: 9.6.5 page: 24
11.2.3 Freewheel switch
• Remove drive unit panelling (see chapter 9.3 page: 19).
• Remove the drive unit connecting plug at the controller (3).
• Disengage motors.
• Set the Multimeter to resistance measuring.
• Measure the braking coil resistance (R
req
= ∞ Ω) between the grey and
white cable in the motor plug. The measured value must be infinite.
Drive unit connector
plug
Test results: Chapter:
R < ∞. • Short-circuit in
magnetic brake.
Þ Replace drive unit.
Chapter: 9.6.5 page: 24
11.2.4 Carbon brushes
• Remove drive unit panelling (see chapter 9.3 page: 19).
• Remove the drive unit connecting plug at the controller.
• Remove carbon brushes (2) (see chapter 9.6.4).
• Measure the length (L)
Original length = 18 mm.
Wear limit = 15 mm.
Check the running surface. Only very slight running traces must be noticeable.
If the running surface shows deep grooves, the motor collector is damaged.
Overhaul of the motor collector can only be carried out by
Invacare
®
.
Carbon brushes
Test results: Chapter:
L < 15 mm
Running surface
shows deep scores
• Wear limit exceeded
• Motor collector
damaged
Þ Replace carbon
brushes
Þ Replace drive unit
Chapter: 9.6.4 page: 24
Chapter: 9.6.5 page: 24